Graphene quantum dot purification system

Abstract

The utility model relates to a graphene quantum dot purification system which comprises a purification tank body, a filter cavity is arranged in the purification tank body, a first liquid inlet for alcohol or deionized water to enter the filter cavity is formed in the top of the purification tank body, a first liquid outlet for discharging filtrate is formed in the bottom of the purification tank body, and a second liquid outlet for discharging the filtrate is formed in the bottom of the purification tank body. The first liquid inlet and the first liquid outlet are communicated with the filtering cavity; the liquid filtering plate is arranged in the filtering cavity and is positioned between the first liquid inlet and the first liquid outlet; and the heater is arranged on the side wall of the filtering cavity and is in contact with the filtrate plate.

Description

Technical Field

[0001] The utility model relates to the field of graphene purification, in particular to a graphene quantum dot purification system. Background Art

[0002] Graphene quantum dots are generally obtained by hydrothermal method, which can be roughly divided into two categories according to the types of synthetic raw materials. The first is to use alcohol-soluble organic matter and alcohol solvent as reactants, and the second is to use water-soluble organic matter and deionized water as reactants. In some cases, the hydrothermal product is directly dried after the hydrothermal reaction is completed, so there is a small amount of alcohol-soluble organic matter or water-soluble organic matter from the reaction raw materials on the surface of the obtained graphene quantum dots. At this time, the small amount of residues of these reaction raw materials acts as impurities and reduces the purity of the graphene quantum dots.

[0003] When the stock of the above-mentioned graphene quantum dots is large, there is a lack of a means to quickly remove impurities and purify the graphene quantum dots under existing laboratory conditions. Utility Model Content

[0004] Based on this, it is necessary to provide a graphene quantum dot purification system to address the problem of slow graphene quantum dot purification speed.

[0005] A graphene quantum dot purification system, comprising:

[0006] A purification tank body, wherein a filter chamber is disposed in the purification tank body, a first liquid inlet for alcohol or deionized water to enter the filter chamber is disposed at the top of the purification tank body, and a first liquid outlet for discharging filtrate is disposed at the bottom of the purification tank body, wherein the first liquid inlet and the first liquid outlet are both connected to the filter chamber;

[0007] a filtrate plate, the filtrate plate being installed in the filtration cavity and located between the first liquid inlet and the first liquid outlet; and

[0008] A heater is disposed on a side wall of the filter chamber and in contact with the filtrate plate.

[0009] The filtrate plate of the utility model comprises an annular support plate and a filtrate net arranged in the middle of the annular support plate, the normal direction of the annular support plate is a first direction, and the projection of the annular support plate in the first direction is located within the projection of the first liquid inlet in the first direction.

[0010] The filtrate plate of the utility model further comprises an annular outer baffle plate, and the annular outer baffle plate is arranged on the outer edge of the annular support plate.

[0011] The filtrate plate of the utility model also includes an annular convex rib, which is arranged on the inner edge of the annular support plate. The annular support plate, the annular outer baffle plate and the annular convex rib are arranged to form an annular limiting groove, and the height of the annular outer baffle plate is higher than the height of the annular convex rib.

[0012] The filtrate net of the utility model is recessed in a direction away from the first liquid inlet.

[0013] In the utility model, a ceramic layer is arranged on one side of the annular support plate opposite to the first liquid inlet, and the heater is in contact with the annular support plate.

[0014] In the utility model, a support seat is arranged on the side wall of the filter cavity, the edge of the filtrate plate is supported on the support seat, and a disassembly gap is arranged between the filtrate plate and the side wall of the filter cavity.

[0015] In the utility model, a partial projection of the first liquid inlet in the first direction is located outside the projection of the filtrate plate in the first direction.

[0016] The graphene quantum dot purification system of the utility model further comprises a liquid guiding tube, the end of which is located at the annular support plate, and the liquid guiding tube is installed at the first liquid inlet and can rotate along the circumference of the annular support plate.

[0017] The heater of the utility model is installed on the side wall of the filter cavity and is at least partially located in the disassembly gap, and / or the heater contacts the side of the annular support plate away from the first liquid inlet.

[0018] The beneficial effects of the utility model are:

[0019] Alcohol or deionized water falls to the filtrate plate through the first liquid inlet under the action of gravity, and washes the graphene quantum dots on the surface of the filtrate plate, thereby generating a strong interaction with the impurities on the surface of the graphene quantum dots, and the impact force can further disperse the clumps of graphene quantum dots, so that the impurities are more easily dissolved in the alcohol or deionized water. On this basis, the filtrate plate provides a larger area for dispersing and supporting the graphene quantum dots, so that the alcohol or deionized water can have a larger contact area with the graphene quantum dots, thereby more fully removing impurities from the surface of the graphene quantum dots. After the impurities are dissolved in the alcohol or deionized water, a filtrate is formed, which penetrates through the filtrate plate to the first liquid outlet for discharge.

[0020] The graphene quantum dot purification system of the utility model is suitable for purifying and removing impurities from a large number of graphene quantum dots, and impurities can be removed more quickly, with a higher purification speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the cross-sectional structure of the graphene quantum dot purification system in Example 1 of the utility model;

[0022] Figure 2 for Figure 1 The enlarged structural diagram at A in the middle;

[0023] Figure 3 This is a schematic diagram of the three-dimensional structure of the filtrate plate in Example 1 of the utility model;

[0024] Figure 4 This is a schematic cross-sectional structure diagram of the filtrate plate in Example 1 of the utility model;

[0025] Figure 5 This is a schematic diagram of the cross-sectional structure of the filtrate plate in Example 2 of the utility model.

[0026] Reference numerals:

[0027] 1. Purification tank; 11. Filter chamber; 111. Support seat; 12. First liquid inlet; 13. First liquid outlet; 2. Filtrate plate; 21. Annular support plate; 22. Filtrate net; 23. Annular convex rib; 24. Annular outer baffle; 25. Annular limit groove; 26. Disassembly and assembly gap; 3. Heater; 4. Liquid guide tube. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0034] Embodiment 1:

[0035] See also Figure 1-Figure 4 This embodiment provides a graphene quantum dot purification system, including a purification tank 1, a filtrate plate 2 and a heater 3.

[0036] A filter chamber 11 is provided in the purification tank body 1, a first liquid inlet 12 is provided at the top of the purification tank body 1, and a first liquid outlet 13 is provided at the bottom of the purification tank body 1, and the first liquid inlet 12 and the first liquid outlet 13 are both connected to the filter chamber 11. The first liquid outlet 13 may be provided with a valve.

[0037] The filtrate plate 2 is horizontally installed in the filter chamber 11. In the direction perpendicular to the horizontal plane, the filtrate plate 2 is located between the first liquid inlet 12 and the first liquid outlet 13, wherein the first liquid outlet 13 can be located directly below the filtrate plate 2 or at the side and below the filtrate plate 2.

[0038] The heater 3 is arranged on the side wall of the filter chamber 11 and contacts the filtrate plate 2. The heater 3 can be arranged through the first liquid inlet 12 or by opening a hole on the side wall of the purification tank 1.

[0039] The working principle and method of the graphene quantum dot purification system of this embodiment are as follows: the filtrate plate 2 provides a large support area for the laying of solid graphene quantum dots, so that the graphene quantum dots form a relatively dispersed state, and the particle surface is exposed as much as possible, and then the cleaning agent is injected from the first liquid inlet 12. The cleaning agent flushes the surface of the solid graphene quantum dots under the action of gravity, thereby generating a strong interaction with the impurities on the surface of the graphene quantum dots, so that the impurities can be dissolved into the cleaning agent as soon as possible, and then penetrate to the bottom of the filtrate plate 2 with the cleaning agent, and finally the filtrate is discharged from the first liquid outlet 13. After all the graphene quantum dots are flushed with the cleaning agent, the filtrate plate 2 is heated by the heater 3 to evaporate or volatilize the residual cleaning agent on the surface of the graphene quantum dots.

[0040] The filtrate plate 2 of this embodiment provides a larger area for dispersing and supporting graphene quantum dots, so as to allow the cleaning agent to form a larger contact area with the impurities on the surface of the graphene quantum dots. On this basis, gravity is used to enhance the interaction between the cleaning agent and the impurities on the surface of the graphene quantum dots, so that the impurities on the surface of the graphene quantum dots can be quickly dissolved into the cleaning agent and seep into the first liquid outlet 13, thereby achieving rapid purification of the graphene quantum dots.

[0041] Among them, if the synthetic raw materials of graphene quantum dots are alcohol-soluble organic matter and alcohol solvent, the graphene quantum dots themselves are water-soluble in most cases and are non-alcohol-soluble, and the impurities on the surface of the graphene quantum dots are alcohol-soluble organic matter. At this time, ethanol is selected as the cleaning agent. The solubility of non-alcohol-soluble graphene quantum dots in ethanol is relatively small, and they remain above the filtrate plate 2 during the ethanol flushing process. The alcohol-soluble organic impurities on the surface of the graphene quantum dots can be dissolved in ethanol and seep to the bottom of the filtrate plate 2. In addition, ethanol is volatile and can be quickly removed after heating.

[0042] If the synthetic raw materials of graphene quantum dots are water-soluble organic matter and deionized water, the graphene quantum dots themselves are alcohol-soluble in most cases and are water-insoluble, and the impurities on the surface of the graphene quantum dots are water-soluble organic matter. At this time, deionized water is selected as the cleaning agent. The solubility of the water-insoluble graphene quantum dots in deionized water is relatively small, and they remain above the filtrate plate 2 during the flushing process with deionized water. The water-soluble organic impurities on the surface of the graphene quantum dots can be dissolved in the deionized water and seep to the bottom of the filtrate plate 2.

[0043] The filtrate plate 2 of this embodiment includes an annular support plate 21 and a filtrate net 22 arranged in the middle of the annular support plate 21. The solid graphene quantum dots are only laid on the annular support plate 21, and the annular support plate 21 can only support the graphene quantum dots and cannot play a role in permeating the filtrate. After the cleaning agent drips on the graphene quantum dots, it will first reach the annular support plate 21, and then flow to the filtrate net 22 and penetrate to the bottom of the filtrate net 22. The setting of the annular support plate 21 increases the contact time between the graphene quantum dots and the cleaning agent, and the impurities on the surface of the graphene quantum dots can be more effectively dissolved in the cleaning agent, thereby improving the purification effect of the graphene quantum dots and reducing the consumption of the cleaning agent.

[0044] The normal direction of the annular support plate 21 is the first direction. In order to enable the cleaning agent at the first liquid inlet 12 to flow to the annular support plate 21 under the action of gravity to flush the graphene quantum dots thereon, the projection of the annular support plate 21 in the first direction needs to be within the projection of the first liquid inlet 12 in the first direction.

[0045] In order to ensure that the cleaning agent on the annular support plate 21 can only flow to the filtrate net 22, the filtrate plate 2 further includes an annular outer baffle 24, which is arranged at the outer edge of the annular support plate 21. The height of the annular outer baffle 24 is higher than the height of the graphene quantum dots stacked on the annular support plate 21, so as to prevent the graphene quantum dots from being washed to the outside of the filtrate plate 2 during the washing process.

[0046] Preferably, the filtrate plate 2 further comprises an annular convex rib 23, which is arranged on the inner edge of the annular support plate 21, so that the annular support plate 21, the annular outer baffle plate 24 and the annular convex rib 23 are surrounded to form an annular limiting groove 25. The height of the annular convex rib 23 is very short, and the height of the annular outer baffle plate 24 is higher than the height of the annular convex rib 23. Limited by the height of the annular convex rib 23, the actual space of the annular limiting groove 25 is limited, and the amount of cleaning agent that can be accumulated is very small, and it is easy to be filled with cleaning agent. Therefore, as the cleaning agent continues to fall, the cleaning agent with impurities dissolved in the annular limiting groove 25 can continuously pass over the annular convex rib 23 and flow to the filtrate net 22, so that the impurities in the annular limiting groove 25 are continuously removed, and the cleaning agent in the annular limiting groove 25 cannot pass over the annular outer baffle plate 24. However, since the thickness of the graphene quantum dots laid on the annular support plate 21 is very thin, the annular convex rib 23 can effectively prevent the graphene quantum dots on the annular support plate 21 from being washed to the filtrate mesh 22, prevent adhesion between the graphene quantum dots and the filtrate mesh 22, and reduce the loss of graphene quantum dots during the purification process.

[0047] After the purification is completed, the heater 3 is turned on, and the heater 3 conducts the generated heat to the graphene quantum dots on the annular support plate 21 through the annular support plate 21, so that the graphene quantum dots are heated and dried. In order to take into account both mechanical strength and thermal conductivity, the annular support plate 21 can be made of metal. But on the other hand, the graphene quantum dots may have a small amount of chemical reaction with the metal annular support plate 21 during the temperature increase process, which will reduce the purity of the graphene quantum dots. Therefore, the annular support plate 21 is provided with a ceramic layer on one side relative to the first liquid inlet 12, and further, the inner wall of the entire annular limit groove 25 can be provided with a ceramic layer. On the one hand, the ceramic layer itself has good thermal conductivity and can conduct the heat on the annular support plate 21 to the graphene quantum dots. On the other hand, the drying temperature is generally only about 70°C, and under this temperature condition, the ceramic layer and the graphene quantum dots have very good chemical stability.

[0048] In order to increase the heat conduction efficiency of the heater 3 to the annular support plate 21, the heater 3 contacts the side of the annular support plate 21 away from the first liquid inlet 12, so that a larger heat conduction area is obtained between the heater 3 and the annular support plate 21. At the same time, the graphene quantum dots and the heater 3 are respectively attached to the two sides of the annular support plate 21, so that there is a shorter heat conduction efficiency between the heater 3 and the graphene quantum dots, thereby improving the drying efficiency, and thus making the entire graphene quantum dot purification work more efficient.

[0049] A support seat 111 is provided on the side wall of the filter chamber 11, and the outer edge of the annular support plate 21 is supported on the support seat 111, so that the filtrate plate 2 is supported in the filter chamber 11. In order to facilitate the disassembly and assembly of the filtrate plate 2, a disassembly and assembly gap 26 is provided between the annular outer baffle plate 24 and the side wall of the filter chamber 11, and the annular outer baffle plate 24 can be easily lifted after the hand is inserted into the disassembly and assembly gap 26.

[0050] In some embodiments, the heater 3 is mounted on the side wall of the filter chamber 11 and is at least partially located in the disassembly gap 26, thereby allowing the heater 3 to contact the annular outer baffle 24, which can also increase the heat conduction area between the heater 3 and the filtrate plate 2.

[0051] Furthermore, a partial projection of the first liquid inlet 12 in the first direction is located outside the projection of the filtrate plate 2 in the first direction, that is, the size of the first liquid inlet 12 is larger than the size of the filtrate plate 2, thereby allowing the filtrate plate 2 to directly enter and exit the filter chamber 11 through the first liquid inlet 12.

[0052] Since it is difficult to flush the entire surface of the annular support plate 21 in the laboratory, the graphene quantum dot purification system also includes a liquid guide tube 4, the upper end of the liquid guide tube 4 is located at the first liquid inlet 12, and the lower end of the liquid guide tube 4 is located at the annular support plate 21. An annular guide rail can be set at the opening edge of the first liquid inlet 12, and the upper end of the liquid guide tube 4 can slide with the annular guide rail, thereby allowing the liquid guide tube 4 to rotate along the circumference of the annular support plate 21, thereby flushing the graphene quantum dots on the surface of the annular support plate 21 in sequence.

[0053] The liquid guiding tube 4 and the annular guide rail are detachably matched, and the filtrate plate 2 can be avoided only after the liquid guiding tube 4 is removed, thereby allowing the filtrate plate 2 to be disassembled and assembled.

[0054] Embodiment 2:

[0055] See also Figure 5 In this embodiment, the filtrate plate 2 only includes an annular support plate 21, a filtrate net 22 and an annular outer baffle plate 24. The filtrate net 22 is recessed in a direction away from the first liquid inlet, so that the cleaning agent on the annular support plate 21 can flow to the filtrate net 22 more smoothly.

[0056] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A graphene quantum dot purification system, characterized in that: include: A purification tank body (1), wherein a filter chamber (11) is provided in the purification tank body (1), a first liquid inlet (12) for alcohol or deionized water to enter the filter chamber (11) is provided at the top of the purification tank body (1), and a first liquid outlet (13) for discharging filtrate is provided at the bottom of the purification tank body (1), and the first liquid inlet (12) and the first liquid outlet (13) are both connected to the filter chamber (11); a filtrate plate (2), the filtrate plate (2) being installed in the filtration chamber (11) and located between the first liquid inlet (12) and the first liquid outlet (13); and A heater (3), wherein the heater (3) is arranged on a side wall of the filter chamber (11) and is in contact with the filtrate plate (2).

2. The graphene quantum dot purification system according to claim 1, characterized in that: The filtrate plate (2) comprises an annular support plate (21) and a filtrate net (22) arranged in the middle of the annular support plate (21); the normal direction of the annular support plate (21) is a first direction; and the projection of the annular support plate (21) in the first direction is located within the projection of the first liquid inlet (12) in the first direction.

3. The graphene quantum dot purification system according to claim 2, characterized in that: The filtrate plate (2) further comprises an annular outer baffle plate (24), wherein the annular outer baffle plate (24) is arranged on the outer edge of the annular support plate (21).

4. The graphene quantum dot purification system according to claim 3, characterized in that: The filtrate plate (2) further comprises an annular convex rib (23), wherein the annular convex rib (23) is arranged on the inner edge of the annular support plate (21), and the annular support plate (21), the annular outer baffle plate (24) and the annular convex rib (23) are arranged to form an annular limiting groove (25), and the height of the annular outer baffle plate (24) is higher than the height of the annular convex rib (23).

5. The graphene quantum dot purification system according to claim 3, characterized in that: The filtrate net (22) is recessed in a direction away from the first liquid inlet (12).

6. The graphene quantum dot purification system according to claim 2, characterized in that: A ceramic layer is provided on a surface of the annular support plate (21) opposite to the first liquid inlet (12), and the heater (3) is in contact with the annular support plate (21).

7. The graphene quantum dot purification system according to claim 5, characterized in that: A support seat (111) is provided on the side wall of the filter chamber (11), the edge of the filtrate plate (2) is supported on the support seat (111), and a disassembly gap (26) is provided between the filtrate plate (2) and the side wall of the filter chamber (11).

8. The graphene quantum dot purification system according to claim 7, characterized in that: A partial projection of the first liquid inlet (12) in the first direction is located outside a projection of the filtrate plate (2) in the first direction.

9. The graphene quantum dot purification system according to claim 8, characterized in that: The graphene quantum dot purification system further comprises a liquid guide tube (4), the end of the liquid guide tube (4) being located at the annular support plate (21), and the liquid guide tube (4) being installed at the first liquid inlet (12) and being capable of rotating along the circumference of the annular support plate (21).

10. The graphene quantum dot purification system according to claim 7, characterized in that: The heater (3) is mounted on the side wall of the filter cavity (11) and is at least partially located in the assembly / disassembly gap (26), and / or the heater (3) contacts a side of the annular support plate (21) facing away from the first liquid inlet (12).

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